refactor(guest): retire legacy guest app and move shared modules

resources/js/shared/guest/lib/localizeTaskLabel.ts

@@ -0,0 +1,51 @@
+import type { LocaleCode } from '../i18n/messages';
+
+type LocalizedRecord = Record<string, string | null | undefined>;
+
+function pickLocalizedValue(record: LocalizedRecord, locale: LocaleCode): string | null {
+  if (typeof record[locale] === 'string' && record[locale]) {
+    return record[locale] as string;
+  }
+
+  if (typeof record.de === 'string' && record.de) {
+    return record.de as string;
+  }
+
+  if (typeof record.en === 'string' && record.en) {
+    return record.en as string;
+  }
+
+  const firstValue = Object.values(record).find((value) => typeof value === 'string' && value);
+  return (firstValue as string | undefined) ?? null;
+}
+
+export function localizeTaskLabel(
+  raw: string | LocalizedRecord | null | undefined,
+  locale: LocaleCode,
+): string | null {
+  if (!raw) {
+    return null;
+  }
+
+  if (typeof raw === 'object') {
+    return pickLocalizedValue(raw, locale);
+  }
+
+  const trimmed = raw.trim();
+  if (!trimmed) {
+    return null;
+  }
+
+  if (trimmed.startsWith('{')) {
+    try {
+      const parsed = JSON.parse(trimmed);
+      if (parsed && typeof parsed === 'object') {
+        return pickLocalizedValue(parsed as LocalizedRecord, locale) ?? trimmed;
+      }
+    } catch {
+      return trimmed;
+    }
+  }
+
+  return trimmed;
+}